I had the J3 for about three days before it died on me
I also had the S9 for a while, and the main difference I noticed was that on a flat setting, no enhancements whatsoever - the J3 sounded more expansive and less 'dead' than on the S9 with the same settings. But once I started to play around with BBE and other enhancements, it started to sound pretty much the same as the S9 (which was warmish to my ears).
The J3 touchscreen is definitely more responsive than the S9. It's also easier to operate with one hand than the S9, although I didn't like that the J3 volume controls were placed on the bottom right, because (I don't really know how!) I kept managing to press them by accident when I moved my hand to use one of the other controls.
What else, well, I had a 16GB card that the J3 wouldn't read. There was nothing wrong with the card because I put it in an SD adaptor and my computer read it just fine. And when I put the card back into the J3, it could see the music I'd transferred to it - but it still didn't see there was a card in it. And finally, after disconnecting it for about the fith time - it died on me, and the reset button wouldn't bring it back to life so I returned it.
Despite the issues, it was a very nice dap. Very similar to the Zune HD in appearance, but with physical controls so you could use it without having to take it out of your pocket. And although I never got to test out the battery life, I know that the Zune HD never lasted for more than about 20 hours, which is way short of the 64 hours claimed by Cowon. Shame it died on me. I might wait for the 32GB and try it again
Oh, and I tried it with the JVC FX700, MTPC and UE700. The UE700 (which sounded really harsh, cold and hollow on my Touch) actually sounded pretty nice with the J3, thanks to all the enhancements you can add. The UE700 are very bright and can be a little too lively, but matching them with the J3 + EQ made them sound really nice, like a different pair of earphones altogether.
EDIT: The speaker is pretty loud, much louder than the Touch speaker. and better quality too.
Edited by soozieq - 6/1/10 at 6:37am